In which line from this excerpt of John Keats's "Ode to Autumn" has the poet personified the season of autumn as a young maiden?

Ode to Autumn is an unconventional appreciation of the autumn season. John Keats personified the season of autumn as a young maiden where i t is understood that maturity and ripeness as one with the old age when he mentioned it in this line:

"Season of mists and mellow fruitfulness! / Close bosom friend of the maturing sun".